Process for manufacturing incandescent lamps



Jan.

Y. SAKAKURA PROCESS FOR MANUFACTURING INCANDESCENT LAMPS Jan, 1, 1929.

' Y. SA KAKURA PROCESS FOR MANUFACTURING INCANDESCENT LAMPS Filed June 1, 1927 2 sheets-sheet 2 L a. E

Patented Jan. 1, 1929.

UNITED STATES ATFENTY FFICE.

PROCESS FOR MANUFACTURING INOA NDESCENT LAMPS.

. Application filed June 1, 1927, Serial- No. 195,815, and in Japan April 6, 1927.

My invention relates to a process for manufacturing an incandescent lamp, and has for its object to render the manufacture of incandescent lamps simple and economical.

a In the known art of manufacturing the incandescent lamp the lamp bulb is first formed by blowing molten glass in a'mould then cut off the blow pipe and cooled. The lamp contents with the filament on the frame is then placed in the bulb and sealed up thereto by the application of heat. The bulb is afterward exhausted of air and fitted with the base to form an incandescent lamp.

According to the present invention the lamp contents properly put together are previously held within the blow pipe. After the bulb has been formed the lamp contents are immediately forwarded into the bulb and are sealed thereto while hot. Then the bulb is cut off the blow pipe .to form an electric lamp. Thus the formation of bulb and the sealing of the contents may be successively performed before the bulb is cooled and the operation in rendered more easy and economical. In the manufacture of those incandescent lamps filled with inert gases, the bulb after having been formed and sealed with the lamp contents, is exhausted of the air contained therein and filled with the inert gas as usual. Whereas, according to the present invention the manufacture of thegas filled lamps may be immediately completed by blowing the bulb with the desired inert gas itself whereby further economy of labour and cost may be obtained.

The invention is more particularly explained with reference to the accompanying drawing in which I Fig. 1 is a longitudinal sectional view of the lamp bulb as formed in the mould.

Fig. 2 is a similar view as the lamp contents are placed in the bulb.

Fig. 3 is an. elevation of the bulb as completed and out off the blow pipe.

Fig. 4 is a cross sectional view of the blow ipe. q p In carrying out the invention in practice the lamp contents viz the filament and lead wires properly placed onthe frame are held in the blow pipe so that 'theyJcan be moved forward. A preferable formof the blow lea-din wires wires ,(11)

pipe is shown. The

the stem (4) of'which is passed through a longitudinal slot (3) formed at the side of the pipe 1) A sleeve (5) provided with a handle (6) is slidably fitted on the pipe (1) and the stem (4) of the clip (2) is fixed thereto. The sleeve (5) is provided with packing rings (7 (7) at its ends to prevent the leakage of blowing air.

The clip (2) is arranged in the pipe (1) to hold the lamp contents put together in a suitable form, an example of which is shown. A glass tube or stem (8) is provided with wire arms (9) on which a spiral filament (10) is helically ends to lead in wires (11) (11). ring (12) is placed on the stem (8) ing wires (11) (11) to hold them in the position. Said stem (8), arms (9), filament (10) and leading wires (11) are previously brought together to form the lamp contents and the upper end of the stem (8) and the (11) (11) are held at the clip (2). hen the sleeve (5) is pulled upward by the handle (6) on the pipe (1) and the lamp contents (1), as shown in Fig. 1.

A suitable quantity of molten glass is taken at the end of the pipe (1) and it is blown in the mould (13) by the human breath or by a suitable mechanical means to form a A glass lamp bulb (14) as in the known art. After the bulb (14) has been formed the sleeve (5) is immediately pulled downward by the handle 6) on the pipe 1) and the lamp contents with the filament (10) is forwarded to the il esired position in the bulb (14), as shown in The bulb (14) is pressed at its neck (15) while hot so that the stem 8) and the leading (11) are hermetically sealed thereto. Then the bulb (14) is cut off the pipe (1) and the glass body of the incandescent lamp is made as shown in Fig. 3. For the lamp to be exhausted through the glass tube (8) as shown, the tube (8) is prefe erably provided at its bore with a slender metal tube (16) or the like to prevent the collapse of the glass tube against the sealing pressurev of the neck 15).

Having now particularly described and ascarried and connected at both and leadare kept quiteinside the pipe certained the nature of my said invention and after the lamp bulb has been blown the and 1n What manner the same is to be perlamp contents are forwarded into the bulb 1 formed I declare that what I claim is just formed and are immediately sealed An improved process for manufacturing an thereto, substantially as described.

5 incandescent lamp characterized that the fil- In testimony whereof I have affixed my ament, its supports and lead in means, propsignature. erly brought together to form the lamp contents are sildably held within the blow pipe YUKITOSHI SAKAKURA. 

